What the pilot must understand is that the limit is a BHP limit which is fixed. The point on the MPG at which that limit is reached is variable. The MP Limit Chart requires OAT and Press' Alt when determining the MP limit, this is ok until you add carb' heat as this will directly effect the engine efficiency thus more MP to achieve the same BHP. Think HP Limit and not so much MP Limit - when is my engine developing R22 124BHP/131BHP - R44 205BHP/225BHP/245BHP.
Last edited by Dick Sanford; 10th Sep 2012 at 23:29.